[tor-relays] 1 circuit using 1.5Gig or ram? [0.3.3.2-alpha]

[David Goulet]

On 12 Feb (21:14:14), Stijn Jonker wrote:
> Hi David,
> 
> On 12 Feb 2018, at 20:44, David Goulet wrote:
> 
> > On 12 Feb (20:09:35), Stijn Jonker wrote:
> >> Hi all,
> >>
> >> So in general 0.3.3.1-alpha-dev and 0.3.3.2-alpha running on two nodes
> >> without any connection limits on the iptables firewall seems to be a lot
> >> more robust against the recent increase in clients (or possible [D]DoS). But
> >> tonight for a short period of time one of the relays was running a bit "hot"
> >> so to say.
> >>
> >> Only to be greated by this log entry:
> >> Feb 12 18:54:55 tornode2 Tor[6362]: We're low on memory (cell queues total
> >> alloc: 1602579792 buffer total alloc: 1388544, tor compress total alloc:
> >> 1586784 rendezvous cache total alloc: 489909). Killing circuits
> >> withover-long queues. (This behavior is controlled by MaxMemInQueues.)
> >> Feb 12 18:54:56 tornode2 Tor[6362]: Removed 1599323088 bytes by killing 1
> >> circuits; 39546 circuits remain alive. Also killed 0 non-linked directory
> >> connections.
> >
> > Wow... 1599323088 bytes is insane. This should _not_ happen for only 1
> > circuit. We actually have checks in place to avoid this but it seems they
> > either totally failed or we have a edge case.
> Yeah it felt a "bit" much. A couple megs I wouldn't have shared :-)
> 
> > Can you tell me what scheduler were you using (look for "Scheduler" in the
> > notice log).
> 
> The schedular always seems to be KIST (never played with it/tried to change it)
> Feb 11 19:58:24 tornode2 Tor[6362]: Scheduler type KIST has been enabled.
> 
> > Any warnings in the logs that you could share or everything was normal?
> Besides that ESXi host gave an alarm about CPU usage, nothing odd in the logs around that time I could find.
> The general syslog logging worked both locally on the host and remote as the hourly cron jobs surround this entry.
> 
> 
> > Finally, if you can share the OS you are running this relay and if Linux, the
> > kernel version.
> 
> Debian Stretch, Linux tornode2 4.9.0-5-amd64 #1 SMP Debian 4.9.65-3+deb9u2 (2018-01-04) x86_64 GNU/Linux
> not sure it matters, but ESXi based VM, running with 2 vCPU's based on i5-5300U, 4 Gig of memory
> 
> No problems, happy to squash bugs. I guess one of the "musts" when running Alpha code, although this might not be alpha related (I can't judge).

Thanks for all the information!

I've opened https://bugs.torproject.org/25226

Cheers!
David

-- 
1xYrq8XhE25CKCQqvcX/cqKg04v1HthMMM3PwaRqqdU=
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